North and South Korea will march under one flag at the opening ceremony, in a symbolic show of unity.

Kim Yo Jong is said to be extremely close to her brother and has taken an increasingly prominent role in the regime in recent years. She is a member of the country’s politburo, the regime’s top-level decision-making body, and holds office as vice director of the party’s Propaganda and Agitation Department.

She was blacklisted by the U.S. Treasury last year for human rights abuses and censorship.

Washington is sending its own delegation, led by Pence, which will be looking to keep up its campaign of pressure against the regime and block any attempts by the North to leverage its presence. The delegation will include the father of Otto Warmbier, the American college student who was held by North Korea for more than a year and died shortly after being released to the U.S. in a coma.

“We're traveling to the Olympics to make sure that North Korea doesn't use the powerful symbolism and the backdrop of the Winter Olympics to paper over the truth about their regime,” Pence recently told reporters.

He also said the U.S. was preparing to announce new economic sanctions he described as the “toughest and most aggressive” yet against North Korea.